http://musescore.org/ MuseScore is a free cross-platform WYSIWYG music notation program, that offers a cost-effective alternative to professional programs such as Sibelius and Finale.
You can print beautifully engraved sheet music or save it as PDF or MIDI file. Some highlights:
Screenshot
WYSIWYG, notes are entered on a "virtual note sheet"
Unlimited number of staves
Up to four voices per staff
Easy and fast note entry with your keyboard, mouse, or MIDI keyboard
http://musescore.org/
MuseScore is a free cross-platform WYSIWYG music notation program, that offers a cost-effective alternative to professional programs such as Sibelius and Finale.
You can print beautifully engraved sheet music or save it as PDF or MIDI file.
Some highlights: